Flight Reliability
F9 3378 · Frontier Airlines
Miami → San Juan (MIA–SJU)
70
Usually Fine
WanderNerd Reliability Score
- 71%
- Arrive within 15 minutes
- 12 min
- Average arrival delay
- 1.9%
- Cancelled
- 6 min early
- Median arrival delay
Based on 104 historical flights. Data through May 2026.
What the data says
Morning-you made the right choice.
F9 3378 departing between 6–9 AM arrived on time 86% of the time, versus 50% between 9 PM–12 AM.
Sunday scaries are real for this one.
F9 3378 arrived on time 79% of the time on Thursdays and just 59% on Sundays. That gap is worth planning around.
A bit behind the MIA–SJU route.
F9 3378 arrived on time 71% of the time, versus 75% across the MIA–SJU route.
The breakdown
- Mon65%(23 flights)
- Tue—(2 flights)
- Wed—(5 flights)
- Thu79%(14 flights)
- Fri76%(29 flights)
- Sat—(7 flights)
- Sun59%(22 flights)
- 3–6 AM64%(22 flights)
- 6–9 AM86%(43 flights)
- 9 AM–12 PM—(3 flights)
- 12–3 PM—(7 flights)
- 3–6 PM—(2 flights)
- 6–9 PM—(5 flights)
- 9 PM–12 AM50%(20 flights)
62%
Dec
Sep 100% → Dec 62% on time
| Month | On-time percentage | Flights |
|---|---|---|
| September 2025 | 100% | 16 |
| November 2025 | 83% | 18 |
| December 2025 | 62% | 21 |
- Departures on time
- 69%
- Diverted
- 0%
- Flights flown
- 102
- Months covered
- 11
Same route, other flights
Keep nerding
Based on 104 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.